Quartz: Google and Facebook are losing their locks on digital advertising

Quartz: Google and Facebook are losing their locks on digital advertising. “Google and Facebook are loosening their grips on online advertising. The web giants will command $61 billion in US digital-advertising spending in 2018, eMarketer predicts. Yet, their combined share of the total US digital-advertising market is expected to dip to 56.8%, from 58.5% last year, and keep declining.”